JP4962423B2 - Manufacturing method of heat transfer plate - Google Patents

Description

  The present invention relates to a method for manufacturing a heat transfer plate used in, for example, a heat exchanger, a heating device, a cooling device, or the like.

A heat transfer plate arranged in contact with or close to an object to be heat exchanged, heated or cooled is provided with a heat medium pipe for circulating a heat medium such as high-temperature liquid or cooling water through a base member as a main body. It is formed by insertion.
As a method for manufacturing such a heat transfer plate, for example, a method described in Patent Document 1 is known. 10A and 10B are diagrams showing a conventional heat transfer plate, in which FIG. 10A is a perspective view and FIG. 10B is a cross-sectional view. As shown in FIG. 10, the conventional heat transfer plate 100 includes a base material 102 having a lid groove 106 having a rectangular cross-section opening on the surface and a concave groove 108 opening on the bottom surface of the lid groove 106, and a concave groove 108. A heat medium pipe 116 to be inserted; and a lid plate 110 fitted in the lid groove 106; By performing friction stir welding (main joining) along the parts V ₀ and V ₀ , plasticized regions W ₀ and W ₀ are formed. In addition, in order to perform the work in a better environment, the temporary joining may be performed on the abutting portions V ₀ and V ₀ using a rotating tool smaller than the rotating tool used in the main joining.

JP 2004-314115 A

  As shown in FIG. 10B, the heat transfer plate 100 has a gap 120 formed by the concave groove 108, the outer surface of the heat medium pipe 116 and the lower surface of the lid plate 110. If the gap portion 120 exists inside the plate 100, the heat radiated from the heat medium pipe 116 becomes difficult to be transmitted to the cover plate 110, and the heat conduction efficiency of the heat transfer plate 100 is reduced. It was.

  In addition, when the cover plate 110 of the heat transfer plate 100 is relatively thin, if temporary bonding is performed with a rotary tool having a stirring pin at the lower end of the rotary tool, the cover plate 110 is easily deformed because stress concentrates on the abutting portion. There was a problem of becoming. When the cover plate 110 is deformed, there is a problem that the work of the main joining becomes complicated and the quality of the product is lowered.

  From such a point of view, the present invention provides a method for manufacturing a heat transfer plate that has a high heat conduction efficiency and can easily join a butt portion in a heat transfer plate manufactured by friction stir welding. Let it be an issue.

  In order to solve such a problem, the present invention includes an insertion step of inserting a heat medium pipe into a concave groove formed on a bottom surface of a lid groove opened on the surface side of the base member, and a lid plate in the lid groove. A lid groove closing step of arranging the pin, and a pinless rotating tool is pressed against the abutting portion between the side wall of the lid groove and the side surface of the lid plate, and is relatively moved along the abutting portion to perform temporary joining by frictional heat. And a temporary joining step to be performed, and the surface of the lid plate is made to fluidize by frictional heat in a gap formed around the heat medium pipe by relatively moving the inflow stirring rotary tool along the concave groove. And an inflow stirring step for allowing the plastic fluidized material to flow in.

  According to this manufacturing method, since the gap can be filled by flowing the plastic fluid material into the gap, heat can be efficiently transferred between the heat medium pipe and the surrounding base member and cover plate. Can communicate. As a result, a heat transfer plate with high heat conduction efficiency can be manufactured. For example, the heat transfer plate and the object to be cooled can be efficiently cooled by passing cooling water through the heat medium pipe. Further, by pressing and moving the pinless rotating tool against the abutting portion, the lid plate and the base member can be joined by frictional heat while suppressing deformation of the lid plate. Thereby, an inflow stirring process can be performed in a better environment.

  Further, in the temporary joining step, it is preferable that the end surface of the pinless rotating tool rotating in the circumferential direction is pressed against the abutting portion and relatively moved along the abutting portion to perform temporary joining. Moreover, it is preferable that a spiral protrusion is provided on the end face of the pinless rotary tool. According to this manufacturing method, a temporary joining process can be performed more suitably.

  Further, the present invention provides an insertion step of inserting a heat medium tube into a concave groove formed on the bottom surface of the lid groove that opens on the surface side of the base member, and a lid groove closing step of arranging a lid plate in the lid groove. And rotating the disk-shaped rotating tool having a disk shape in the circumferential direction, and pressing the circumferential surface of the disk-shaped rotating tool against the abutting portion between the side wall of the lid groove and the side surface of the lid plate A temporary joining step of relatively moving along the abutting portion and temporarily joining by frictional heat; and a relative movement of the rotating tool for inflow stirring along the concave groove on the surface of the lid plate, And an inflow stirring step of allowing a plastic fluidized material fluidized by frictional heat to flow into a gap formed around the working tube.

  According to this manufacturing method, since the gap can be filled by flowing the plastic fluid material into the gap, heat can be efficiently transferred between the heat medium pipe and the surrounding base member and cover plate. Can communicate. As a result, a heat transfer plate with high heat conduction efficiency can be manufactured. For example, the heat transfer plate and the object to be cooled can be efficiently cooled by passing cooling water through the heat medium pipe. Moreover, the cover plate and the base member can be joined by frictional heat while suppressing the deformation of the cover plate by pressing and moving the circumferential surface of the disk-shaped rotating tool against the abutting portion. Thereby, an inflow stirring process can be performed in a better environment.

  Moreover, it is preferable that the ditch | groove is provided in the circumferential surface of the said disk shaped rotation tool. According to this manufacturing method, a temporary joining process can be performed more suitably.

  Moreover, it is preferable to perform the degreasing process which degreases the said base member and the said cover board before the said temporary joining process. According to this manufacturing method, the oil and moisture on the abutting surfaces of the base member and the cover plate can be removed, so that the members can be brought into closer contact with each other, and organic residues and decomposition gas are mixed into the plasticized region. Can be prevented.

  Further, before the temporary joining step, plating is performed by plating with a metal having a melting point lower than that of the base member and the lid plate on one of the side wall of the lid groove and the side surface of the lid plate. It is preferable to include a process.

According to such a manufacturing method, the plating layer can be easily melted by frictional heat simply by pressing the rotating tool against the abutting portion, and the two metal members can be bonded well together. Moreover, it is difficult to form an air layer due to the pressurization. Therefore, it is possible to obtain a joint having high heat conduction efficiency.
In addition, since the plating layer is made of a low melting point metal and melts easily, it can be satisfactorily bonded even if the force of pressing the rotating tool is weakened or the moving speed of the rotating tool is reduced. . Thereby, a deformation | transformation of a cover board can be suppressed more.

  Further, in the temporary joining step, it is preferable that the pinless rotating tool or the disk-shaped rotating tool is intermittently pressed along the abutting portion to perform temporary joining by frictional heat. According to this manufacturing method, the inflow stirring process can be performed in a state where the lid plate is securely fixed while reducing the labor and time required for the joining process.

  In the inflow stirring step, it is preferable to insert the tip of the inflow stirring rotary tool deeper than the bottom surface of the lid groove. According to this manufacturing method, the lid plate and the base member can be more reliably joined, and the plastic fluidized material can easily flow into the gap.

  In the inflow agitation step, it is preferable that the plasticized region formed in the temporary joining step is agitated by the inflow agitation rotating tool. According to such a manufacturing method, the inflow stirring process can be performed with the lid plate fixed securely, and the plasticized region exposed to the surface of the heat transfer plate is limited only to the rotating tool for inflow stirring. Can do.

  Further, after the inflow stirring step, an upper lid groove closing step of disposing an upper lid plate that covers the lid plate in an upper lid groove formed wider than the lid groove on the surface side of the lid groove of the base member; An upper lid joining step of performing frictional stirring between the base member and the upper lid plate by relatively moving a rotary tool for joining along the abutting portion between the side wall of the upper lid groove and the side surface of the upper lid plate. Is preferred.

  According to this manufacturing method, on the surface side of the heat transfer plate, since the friction stir welding is further performed using the upper cover plate wider than the cover plate, the heat medium pipe is disposed at a deeper position of the heat transfer plate. be able to.

  According to the method for manufacturing a heat transfer plate according to the present invention, it is possible to easily join the butt portion and to manufacture a product having high heat conduction efficiency.

[First embodiment]
The best embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a heat transfer plate according to the first embodiment. FIG. 2 is an exploded cross-sectional view showing the heat transfer plate according to the first embodiment. FIG. 3 is a cross-sectional view showing the heat transfer plate according to the first embodiment.

As shown in FIGS. 1 to 3, the heat transfer plate 1 according to the first embodiment includes a thick plate-shaped base member 2 having a front surface 3 and a back surface 4, and a lid groove 6 opened on the front surface 3 of the base member 2. And a heat medium pipe 16 to be inserted into the concave groove 8 opened in the bottom surface 5 c of the lid groove 6. The base member 2 and the cover plate 10 are integrally formed by plasticizing regions W ₃ and W ₄ formed by friction stir welding.

  The base member 2 is made of, for example, an aluminum alloy (JIS: A6061). The base member 2 serves to transmit the heat of the heat medium flowing through the heat medium pipe 16 to the outside, or plays a role of transferring external heat to the heat medium flowing through the heat medium pipe 16. As shown in FIG. 2, the heat medium pipe 16 is accommodated therein. A lid groove 6 is recessed in the surface 3 of the base member 2, and a recessed groove 8 narrower than the lid groove 6 is recessed in the center of the bottom surface 5 c of the lid groove 6. The lid groove 6 is a portion where the lid plate 10 covering the heat medium pipe 16 is disposed, and is continuously formed over the longitudinal direction of the base member 2. The lid groove 6 has a rectangular shape in a sectional view, and includes side walls 5 a and 5 b that rise vertically from the bottom surface 5 c of the lid groove 6.

  The concave groove 8 is a portion into which the heat medium pipe 16 is inserted, and is formed continuously over the longitudinal direction of the base member 2. The concave groove 8 is a U-shaped groove with an upper opening, and a semicircular curved surface 7 having a radius of curvature equivalent to the outer periphery of the heat medium pipe 16 is formed at the lower end. The opening portion of the concave groove 8 is formed with a width substantially equal to the outer diameter of the heat medium pipe 16.

As shown in FIGS. 2 and 3, the cover plate 10 is made of an aluminum alloy similar to the base member 2, and has an upper surface (front surface) 11 and a lower surface that form a rectangular cross section substantially the same as the cross section of the cover groove 6 of the base member 2. 12, side surface 13a and side surface 13b. The lid plate 10 is disposed by being inserted into the lid groove 6. The side surfaces 13a and 13b of the lid plate 10 are in surface contact with the side walls 5a and 5b of the lid groove 6 or face each other with a fine gap. Here, as shown in FIG. 3, below the abutting faces of the side surface 13a and the side walls 5a, and butting portion V _1, following the abutting faces of the side face 13b and the sidewall 5b, the butting portion V _2.

  In the present embodiment, as shown in FIG. 2, plating layers m and m plated with a metal having a lower melting point than the base member 2 and the cover plate 10 are provided on the side surfaces 13 a and 13 b of the cover plate 10. By providing the plating layer m between the cover plate 10 and the base member 2, the plating layer m melts at a relatively low temperature due to frictional heat, so that the base member 2 and the cover plate 10 are bonded together in a close contact state. can do. The plating layer m may be formed on the side walls 5a and 5b of the lid groove 6. A detailed description of the plating layer m will be described later.

  The heat medium pipe 16 is formed of, for example, a copper pipe, and is a cylindrical pipe having a hollow portion 18 having a circular cross section as shown in FIG. The outer diameter of the heat medium pipe 16 is formed to be approximately equal to the width of the groove 8, and the lower half of the heat medium pipe 16 and the curved surface 7 of the groove 8 are surfaces as shown in FIG. 3. Contact. The upper end of the heat medium pipe 16 is in line contact with the lower surface 12 of the cover plate 10. The heat medium pipe 16 is a member that circulates a heat medium such as a high-temperature liquid or a high-temperature gas in the hollow portion 18 to transmit heat to the base member 2 and the cover plate 10, or a cooling water in the hollow portion 18, for example. A member that circulates a heat medium such as a cooling gas to transmit heat from the base member 2 and the cover plate 10. Further, for example, a heater may be passed through the hollow portion 18 of the heat medium pipe 16 to transmit heat generated from the heater to the base member 2 and the cover plate 10.

  In the present embodiment, the groove 8 and the lower half of the heat medium pipe 16 are brought into surface contact, and the upper end of the heat medium pipe 16 and the lower surface 12 of the cover plate 10 are brought into line contact. It is not limited to this. For example, the depth of the concave groove 8 may be the same as the outer diameter of the heat medium pipe 16 or a range up to 1.2 times the outer diameter. Further, the width of the groove 8 may be the same as the outer diameter of the heat medium pipe 16 or a range up to 1.1 times the outer diameter.

As shown in FIG. 2, the gaps P ₁ and P ₂ formed around the heat medium pipe 16 are spaces surrounded by the heat medium pipe 16, the concave groove 8, and the lower surface 12 of the lid plate 10. is there. In the present embodiment, since the upper end of the heat medium pipe 16 and the lower surface 12 of the lid plate 10 are in contact with each other, two gaps P ₁ and P ₂ are formed with the contact portion as a boundary. Note that the gaps P ₁ and P ₂ are appropriately determined based on the shape of the concave groove 8 and the heat medium pipe 16 and the like, and are not limited to the above-described form.

As shown in FIGS. 1 and 3, the plasticized regions W ₁ and W ₂ are formed on the base member 2 and the cover plate 10 when the temporary joining process described later is performed on the abutting portions V ₁ and V ₂ . This is an area where the parts are integrated by plastic flow. Note that the plasticizing region includes both a state in which the rotating tool is heated by frictional heat and is actually plasticized, and a state in which the rotating tool passes and returns to room temperature. The plasticized regions W ₁ and W ₂ are indicated by blackened portions in FIG. That is, along the butting portion V _1, V _2, when performing the temporary bonding step using a pinless rotation tool 20 to be described later, the base member 2 according to the periphery of the butting portion V _1, V _2, cover plate 10 and the plating After the metal material of the layer m is fluidized by the frictional heat of the pinless rotary tool 20, it is solidified again and integrated.

As shown in FIGS. 1 and ₃ , the plasticizing regions W ₃ and W ₄ include the plasticizing regions W ₁ and W ₂ , and will be described later along the concave groove 8. It is generated by moving. The plasticizing regions W ₃ and W ₄ are made of the plastic fluid material Q (a part of the plasticizing regions W ₃ and W ₄ ) fluidized by frictional heat generated by the rotation of the inflow stirring rotary tool 25 of the heat medium pipe 16. It is a part generated when flowing into the void P formed in the periphery. That is, the plasticized regions W ₃ and W ₄ are regions in which a part of the base member 2 and the cover plate 10 are plastically flowed and flow into the gap portion P to be integrated, and are in contact with the heat medium pipe 16. To do. The plasticized regions W ₃ and W ₄ are indicated by hatched portions in FIG.

  When performing friction stir welding, the plastic fluid material Q is placed in the gap P by setting the push-in amount and insertion position of the inflow stirring rotary tool 25 based on the shape, size, etc. of the gap P. It can flow in suitably. That is, it is preferable that the inflow and stirring rotary tool 25 is brought close to the heat medium pipe 16 so that the heat medium pipe 16 is not crushed, and the plastic fluid material Q flows into the gap portion P without a gap.

Next, a method for manufacturing the heat transfer plate 1 will be described.
4A and 4B are diagrams showing the rotary tool according to the first embodiment, in which FIG. 4A is a perspective view showing a pinless rotary tool, and FIG. 4B is a side view showing the inflow stirring rotary tool. It is. FIG. 5 is a cross-sectional view showing a method of manufacturing a heat transfer plate, where (a) shows a cutting process, and (b) shows an insertion process in which a heat medium pipe is inserted. It is a figure and (c) is the figure which showed the cover groove | channel obstruction | occlusion process. 6A and 6B are cross-sectional views showing a method for manufacturing a heat transfer plate, wherein FIG. 6A is a view showing a temporary joining step, and FIG. 6B is a view showing an inflow stirring step.

The manufacturing method of the heat transfer plate according to the first embodiment includes a cutting step for forming the base member 2, a degreasing step for degreasing the base member 2 and the lid plate 10, and a plating step for forming the plating layer m on the lid plate 10. An insertion step of inserting the heat medium pipe 16 into the concave groove 8 formed in the base member 2, a lid groove closing step of disposing the lid plate 10 in the lid groove 6, and the abutting portions V ₁ and V ₂ A temporary joining step in which the pinless rotating tool 20 is moved and temporarily joined, and the surface 11 of the cover plate 10 is moved along the concave groove 8 to move the inflow agitating rotating tool 25 around the heat medium pipe 16. And an inflow stirring step of allowing the plastic fluidized material Q fluidized by frictional heat to flow into the gap P formed in the above.

Here, the pinless rotation tool 20 and the inflow stirring rotation tool 25 will be described in detail with reference to FIG.
As shown in FIG. 4A, the pinless rotating tool 20 is made of, for example, tool steel, and a plurality of cylindrical tool main bodies 21 and a plurality of radial extending from the center of the bottom surface 22 (lower end surface) thereof. Of the projections 23, 23. That is, the pinless rotating tool 20 is characterized in that it does not include the pin 28 (stirring pin) corresponding to FIG. The projecting bodies 23 are arranged radially and are formed to draw an arc with a predetermined curvature. The shape and the number of the protrusions 23 are not particularly limited, but when the pinless rotary tool 20 is pressed against the abutting portions V ₁ and V ₂ , it may be plasticized with a good balance. preferable.

  As shown in FIG. 4B, the inflow stirring rotary tool 25 is made of, for example, tool steel, and includes a cylindrical tool body 26 and a pin 28 that is suspended from the center of the bottom surface 27 with a concentric axis. Have. The pin 28 is formed in a tapered shape that becomes narrower toward the tip. A plurality of small grooves (not shown) and screw grooves along the radial direction may be formed on the peripheral surface of the pin 28 along the axial direction.

  The inflow agitation rotating tool 25 is larger than the pinless rotating tool 20. Specifically, when the friction stir welding is performed by pushing the inflow stirring rotary tool 25 into the upper surface 11 of the lid plate 10, the lower end portion of the pin 28 (the tip of the inflow stirring rotary tool 25) The thing of the magnitude | size which becomes lower than the bottom face 5c is employ | adopted.

(Cutting process)
First, as shown in FIG. 5A, the lid groove 6 is formed in the thick plate member by a known end mill process. Further, a concave groove 8 having a semicircular cross section is formed on the bottom surface 5c of the lid groove 6 by end milling. Thereby, the base member 2 provided with the cover groove 6 and the concave groove 8 opened in the bottom surface 5c of the cover groove 6 is formed. The concave groove 8 is provided with a curved surface 7 having a semicircular cross section in the lower half, and is opened upward with a certain width from the upper end of the curved surface 7. In addition, in 1st embodiment, although the base member 2 was formed by the end mill process, you may use the extrusion shape material and castings made from aluminum alloy.
(Degreasing process)
Next, a degreasing process is performed on the base member 2 and the cover plate 10. In the degreasing step, the base member 2 and the cover plate 10 are immersed in a degreasing treatment liquid such as alcohol or acetone in a degreasing treatment tank (not shown) to remove oil and fat such as processing oil and dirt attached to the surface. As a result, it is possible to remove organic substances such as oil and moisture from the base member 2 and the cover plate 10, so that it is possible to prevent organic residues and decomposition gases from entering the plasticized region formed by friction stirring. In addition, it is possible to improve the bondability of friction stirring.

(Insertion process)
Next, as shown in FIG. 5B, the heat medium pipe 16 is inserted into the groove 8. At this time, the lower half of the heat medium pipe 16 is in surface contact with the curved surface 7 forming the lower half of the groove 8.

(Plating process)
Next, as shown in FIG. 5C, the side surfaces 13a and 13b of the lid plate 10 are plated using a predetermined metal to form plated layers m and m. In the present embodiment, the plating layer m is provided on the side surfaces 13 a and 13 b of the lid plate 10, but it may be provided on at least one of the side walls 5 a and 5 b of the lid groove 6 and the side surfaces 13 a and 13 b of the lid plate 10. As the type of metal to be plated, a metal having a lower melting point than the metal forming the base member 2 and the cover plate 10 to be joined is selected. Further, the metal to be plated is preferably a metal that undergoes a eutectic reaction or a peritectic reaction with the metal of the base member 2 and the cover plate 10.

  The thickness of the plating layers m and m is not particularly limited, but is preferably 1 to 30 μm. This is because when the plating layer m is less than 1 μm, the base member 2 and the lid plate 10 are preferably in close contact with each other and are not bonded. On the other hand, if the plating layer m is thicker than 30 μm, the thermal conductivity after bonding is greatly reduced.

The plating method is not particularly limited, and for example, an electroplating method or a so-called dotting method can be employed. Among these, when the electroplating method is adopted, the thickness of the plating layer m can be precisely controlled by controlling the current density and the plating time to form the thin plating layer m. Therefore, the thermal conductivity does not vary after joining.
Note that the plating layer m is not necessarily required, and may be appropriately provided as necessary.

(Cover groove closing process)
Next, as shown in FIG. 5C, the lid plate 10 is disposed in the lid groove 6 of the base member 2. At this time, the lower surface 12 of the cover plate 10 and the upper end of the heat medium pipe 16 are in line contact, and the upper surface 11 of the cover plate 10 is flush with the surface 3 of the base member 2. Further, abutting portions V ₁ and V ₂ are formed by the side walls 5 a and 5 b (see FIG. 5B) of the lid groove 6 and the side surfaces 13 a and 13 b of the lid plate 10.

(Temporary joining process)
Next, as shown in FIG. 6 (a), performing temporary bonded to the butting portion V _1, V ₂ using the pinless rotation tool 20. The provisional bonding step, the butting portion V _1, V _2, while pressing the pinless rotation tool 20, the pinless rotation tool 20 is relatively moved along the butt portions V _1, V _2. The movement trajectory of the pinless rotary tool 20 is formed with plasticized regions W ₁ and W _{2 that} are cooled after being fluidized by frictional heat.
In the present embodiment, the temporary joining process is continuously performed along the abutting portions V ₁ and V ₂ , but the temporary joining process may be intermittently performed. Thereby, labor of temporary joining can be saved.

(Inflow stirring process)
Next, as shown in FIG. 6B, friction stir welding is performed on the upper surface (surface) 11 of the lid plate 10 along the lower groove 8. The inflow agitation step is a step in which the plastic fluid material Q fluidized by friction stir welding is caused to flow into a gap P (see FIG. 2) formed around the heat medium pipe 16, and the friction stir welding is performed. Is performed using the inflow agitation rotating tool 25. In the present embodiment, when the inflow stirring rotary tool 25 is pushed into the upper surface 11 of the lid plate 10 to perform friction stir welding, the lower end of the pin 28 (the tip of the inflow stirring rotary tool 25) is The thing of the magnitude | size which becomes lower than the bottom face 5c is employ | adopted.

In the friction stir welding in the inflow agitation step, the inflow agitation rotating tool 25 that rotates at a high speed is pushed on the upper surface (surface) 11 of the lid plate 10, and the inflow agitation rotation tool 25 is moved along the lower groove 8. The inflow stirring rotary tool 25 is arranged so that a part of the projected portion of the bottom surface 27 (shoulder) of the tool body 26 overlaps the gap P of the heat medium pipe 16. At this time, the tip of the inflow agitation rotating tool 25 is inserted deeper than the bottom surface 5c of the lid groove 6, and the aluminum alloy material of the surrounding lid plate 10 and the base member 2 is caused by frictional heat by the pin 28 rotating at high speed. Is heated and fluidized. The inflow stirring rotary tool 25 is pushed so that the bottom surface 27 of the tool body 26 is lower than the top surface 11 of the lid plate 10. The pushing amount (length) is determined by the volume of the plastic fluidized aluminum alloy material in which the volume of the metal of the cover plate 10 from which the tool body 26 is pushed back is filled in one of the gaps P around the heat medium pipe 16. And the length is equal to the sum of the volume of burrs generated on both sides in the width direction of the plasticized region W ₃ (W ₄ ). Then, the fluidized plastic fluid material Q is pushed out and flows into the gap P by the pushing force of the bottom surface 27 of the tool body 26 of the inflow stirring rotary tool 25. After the friction stir welding in the inflow stirring process, burrs generated on both sides in the width direction of the plasticized regions W ₃ and W ₄ are removed. The friction stir welding is performed on both sides of the groove 8 in the width direction, and the plastic fluid material Q flows into the pair of gaps P ₁ and P ₂ located above the heat medium pipe 16.

  As mentioned above, although the manufacturing method of the heat exchanger plate which concerns on this embodiment was demonstrated, it is not limited to an above described process order, You may perform a plating process after an insertion process.

According to the heat transfer plate 1 formed as described above, the base member 2 and the cover plate 10 are integrated in the plasticized regions W ₃ and W ₄ , and the fluidized plastic fluid material Q is void. It flows into the part P. Thereby, while joining the base member 2 and the cover board 10, the space | gap part P can be filled up. Further, the heat medium pipe 16 is pressurized by the bottom surface 27 (shoulder) of the tool body 26 of the inflow stirring rotary tool 25 through the plastic fluidized material Q during the inflow stirring process. The curved surface 7 can be reliably brought into surface contact. Thereby, for example, heat from the heat medium circulating in the heat medium pipe 16 can be efficiently transmitted.

Moreover, in the temporary joining process, since temporary joining is performed using the pinless rotary tool 20 that does not include pins, deformation of the cover plate 10 can be suppressed. That is, for example, when a relatively thin cover plate 10 is used, if friction stirring is performed with a rotary tool having a pin in the temporary joining step, stress concentrates on the abutting portions V ₁ and V ₂ , so that the cover plate 10 is bent. Deform. Thereby, not only the work of the temporary joining process and the inflow stirring process becomes complicated, but the surface of the heat transfer plate 1 may not be flat and the quality of the product may be lowered. However, according to this embodiment, since it plasticizes in a comparatively shallow area | region by pressing the rotation tool 20 without a pin, a deformation | transformation of the cover board 10 can be suppressed.

  In addition, according to the present embodiment, since the lid plate 10 is preliminarily joined to the base member 2 by performing temporary joining prior to the inflow stirring step, the friction stirring is performed with the lid plate 10 fixed in the inflow stirring step. Bonding can be performed. Therefore, the friction stir welding to which a large pushing force is applied using the relatively large inflow stirring rotary tool 25 can be performed in a stable state.

Incidentally, in the case where the width of the Futamizo 6 and the cover plate 10 is large, plasticized region W ₁ formed by the provisional bonding _step, W ₂ can also be formed outside the plasticized region W _3, W ₄ However, it is preferable that the plasticized regions W ₁ and W ₂ are included in the plasticized regions W ₃ and W ₄ as in the present embodiment. As a result, the plasticizing regions W ₁ and W ₂ can be prevented from being exposed to the outside, and the inflow stirring rotary tool 25 can be moved using the plasticizing regions W ₁ and W ₂ as marks in the inflow stirring step. Therefore, workability can be improved.

[Second Embodiment]
Next, the heat transfer plate according to the second embodiment will be described. FIG. 7A is an exploded cross-sectional view showing the heat transfer plate according to the second embodiment, and FIG. 7B is a cross-sectional view showing the heat transfer plate according to the second embodiment.

  The heat transfer plate 61 according to the second embodiment includes a structure substantially equivalent to the above-described heat transfer plate 1, further disposes the upper cover plate 70 on the surface side of the cover plate 10, and performs friction stir welding. It is different from the first embodiment in that it is joined.

  In addition, the structure equivalent to the above-described heat transfer plate 1 is also referred to as a lower lid portion M below. Moreover, about the member which overlaps with the heat exchanger plate 1 which concerns on 1st embodiment, an equivalent code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

The heat transfer plate 61 includes a base member 62, a heat medium pipe 16 inserted into the groove 8, the lid plate 10, and an upper lid plate 70 disposed on the surface side of the lid plate 10, and is plastic. The integrated regions W _{1 to} W ₆ are integrated by friction stir welding.

As shown in FIGS. 7A and 7B, the base member 62 is made of, for example, an aluminum alloy, and has an upper lid groove 65 formed on the surface 63 of the base member 62 over the longitudinal direction, and an upper lid groove 65. The cover groove 6 is formed continuously in the longitudinal direction on the bottom surface 65c of the cover groove 6 and the concave groove 8 is formed on the bottom surface of the cover groove 6 in the longitudinal direction. The upper lid groove 65 has a rectangular shape in cross section and includes side walls 65a and 65b that rise vertically from the bottom surface. The width of the upper lid groove 65 is formed larger than the width of the lid groove 6. The bottom surface 65c of the upper cover groove 65 is chamfered after the plasticized regions W ₃ and W ₄ are generated, and is flush with the surfaces of the plasticized regions W ₃ and W ₄ .

The heat medium pipe 16 is inserted into the concave groove 8 formed in the lower part of the base member 62, and after being closed by the lid plate 10, is temporarily joined in the plasticized regions W ₁ and W ₂ , and further the lid The plasticized regions W ₃ and W ₄ are formed from the surface of the plate 10 to the lower side of the bottom surface of the lid groove 6, and the plastic fluid material Q flows into the voids P ₁ and P ₂ around the heat medium pipe 16. ing. In other words, the lower lid portion M formed inside the base member 62 is formed substantially the same except for the portion that is chamfered with the heat transfer plate 1 according to the first embodiment.

As shown in FIGS. 7A and 7B, the upper lid plate 70 is made of, for example, an aluminum alloy and has a rectangular cross section substantially the same as the cross section of the upper lid groove 65, and includes an upper surface 71, a lower surface 72, A side surface 73 a and a side surface 73 b are formed perpendicularly from the lower surface 72. The upper lid plate 70 is fitted in the upper lid groove 65. That is, the side surfaces 73 a and 73 b of the upper lid plate 70 are in surface contact with the side walls 65 a and 65 b of the upper lid groove 65 or are arranged with a fine gap. Here, below the abutting faces of the side surface 73a and the side wall 65a, and an upper butt portion _{V 5,} following the abutting faces of the side face 73b and the sidewall 65b, and upper butt portion _{V 6.} The upper abutting portions V ₅ and V ₆ are integrated in the plasticized regions W ₅ and W ₆ by friction stir welding.

The heat transfer plate 61 is manufactured by the same manufacturing method as that of the heat transfer plate 1, after the lower lid portion M is formed in the lower part of the base member 62, the upper lid groove closing step of arranging the upper lid plate 70, It includes an upper lid joining step in which friction stir welding is performed along the parts V ₅ and V ₆ .

(Upper cover groove closing process)
In the upper lid groove closing step, the upper lid plate 70 is disposed in the upper lid groove 65 after the lower lid portion M is formed. At this time, the bottom surface 65c of the upper cover groove 65, and the upper surfaces of the cover plate 10 and the plasticized regions W ₃ and W ₄ are not flat due to the inflow stirring process described above. The surface of the plate 10 and the plasticized regions W ₃ and W ₄ is cut and flattened.

(Upper lid joining process)
In the upper lid joining process, the joining rotary tool (not shown) is moved along the upper abutting portions V ₅ and V ₆ to perform friction stir welding. The joining rotary tool is preferably a rotary tool having a pin, like the inflow stirring rotary tool 25 described above. What is necessary is just to set suitably the pushing depth of the rotation tool for joining in an upper cover joining process according to various conditions, such as the length of a pin and the thickness of the upper cover board 70. FIG.

According to the heat transfer plate 61 according to the embodiment, the upper cover plate 70 is further disposed above the lower cover portion M, and the heat medium pipe 16 is disposed at a deeper position by performing friction stir welding. Can do.
[Third embodiment]
Next, the manufacturing method of the heat exchanger plate which concerns on 3rd embodiment is demonstrated. FIG. 8A is a side view showing a disk-shaped rotary tool according to the third embodiment, and FIG. 8B is a side view showing a temporary joining step according to the third embodiment.
The third embodiment is different from the first embodiment in that the circumferential surface of the disk-like rotary tool is brought into contact with the abutting portions V ₁ and V ₂ in the temporary joining step.

  As shown to (a) of FIG. 8, the disk-shaped rotation tool 40 has the axial part 41 rotated in the circumferential direction of an axis | shaft, and the main-body part 42 attached to the front-end | tip of the axial part 41, and exhibiting a column shape. . One end side of the shaft portion 41 is connected to a drive source (not shown) and is formed to rotate in the circumferential direction of the shaft portion 41. On the circumferential surface (cylindrical surface) of the main body portion 42, a concave groove 43 is recessed at a predetermined depth so as to be inclined with respect to the vertical line over the entire surface.

In the temporary joining step, as shown in FIG. 8B, the circumferential surface of the rotated disk-shaped rotating tool 40 is pressed against the abutting portions V ₁ and V ₂ to perform temporary joining. Thereby, the base member 2 and the cover plate 10 can be temporarily joined by frictional heat.

  The concave grooves 43 formed on the circumferential surface of the disk-shaped rotating tool 40 are not limited to the shape of the present embodiment. For example, you may form a ditch | groove in parallel with a perpendicular line.

  The embodiment according to the present invention has been described above. However, the present invention is not limited to this, and can be appropriately changed without departing from the spirit of the present invention. For example, FIG. 9 is a perspective view showing another form of the pinless rotary tool. Like the pinless rotating tool 200 shown in FIG. 9, a spiral protrusion 230 may be provided on the end surface 220 of the tool. Even if it is such a form, a temporary joining process can be performed suitably.

It is the perspective view which showed the heat exchanger plate which concerns on 1st embodiment. It is an exploded sectional view showing the heat exchanger plate concerning a first embodiment. It is sectional drawing which showed the heat exchanger plate which concerns on 1st embodiment. It is the figure which showed the rotation tool which concerns on 1st embodiment, Comprising: (a) is the perspective view which showed the rotation tool without a pin, (b) is the side view which showed the rotation tool for inflow stirring. It is sectional drawing which showed the manufacturing method of the heat exchanger plate which concerns on 1st embodiment, (a) is the figure which showed the cutting process, (b) is the insertion process which inserted the pipe | tube for heat media. It is the figure shown, (c) is the figure which showed the cover groove | channel closing process. It is sectional drawing which showed the manufacturing method of the heat exchanger plate which concerns on 1st embodiment, (a) is the figure which showed the temporary joining process, (b) is the figure which showed the inflow stirring process. . (A) is the exploded sectional view showing the heat exchanger plate concerning a second embodiment, and (b) is the sectional view showing the heat exchanger plate concerning a second embodiment. (A) is the side view which showed the disk shaped rotation tool which concerns on 3rd embodiment, (b) is the side view which showed the temporary joining process which concerns on 3rd embodiment. It is the perspective view which showed the other form of the rotation tool without a pin. It is the figure which showed the conventional heat exchanger plate, Comprising: (a) is a perspective view, (b) is sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat-transfer plate 2 Base member 5a Side wall of lid groove 5b Side wall of lid groove 5c Bottom surface of lid groove 6 Lid groove 8 Concave groove 10 Lid plate 11 Upper surface of lid plate 11
13a (Cover plate) side surface 13b (Cover plate) side surface 16 Heat medium tube 20 Pinless rotation tool 25 Inflow stirring rotation tool 40 Disk-shaped rotation tool 43 Concave groove 61 Heat transfer plate 62 Base member 65 Upper cover groove 65a Side wall 65b (of upper lid groove) Side wall 70 Upper lid plate 73a Side surface of upper lid plate 73b Side surface of upper lid plate P Cavity portion Q Plastic fluidizing material V Butting portion W Plasticization region

Claims (11)

An insertion step of inserting the heat medium pipe into the concave groove formed on the bottom surface of the lid groove opening on the surface side of the base member;
A lid groove closing step of disposing a lid plate in the lid groove;
A temporary joining step in which a pinless rotating tool is pressed against the abutting portion between the side wall of the lid groove and the side surface of the lid plate, and is temporarily moved by frictional heat by relatively moving along the abutting portion;
On the surface of the lid plate, a plastic fluidized material fluidized by frictional heat flows into a gap formed around the heat medium tube by relatively moving the inflow stirring rotary tool along the concave groove. An inflow agitation step for producing a heat transfer plate.   In the temporary joining step, the end surface of the pinless rotating tool rotating in the circumferential direction is pressed against the abutting portion and relatively moved along the abutting portion to perform temporary joining. The manufacturing method of the heat-transfer board of description.   The method of manufacturing a heat transfer plate according to claim 2, wherein a spiral protrusion is provided on an end face of the pinless rotating tool. An insertion step of inserting the heat medium pipe into the concave groove formed on the bottom surface of the lid groove opening on the surface side of the base member;
A lid groove closing step of disposing a lid plate in the lid groove;
Rotate the disk-shaped rotating tool that exhibits a disk shape in the circumferential direction, and press the circumferential surface of the disk-shaped rotating tool against the abutting portion between the side wall of the lid groove and the side surface of the lid plate, A temporary bonding step of performing temporary bonding by frictional heat by relatively moving along the abutting portion;
On the surface of the lid plate, a plastic fluidized material fluidized by frictional heat flows into a gap formed around the heat medium tube by relatively moving the inflow stirring rotary tool along the concave groove. An inflow agitation step for producing a heat transfer plate.   The method for manufacturing a heat transfer plate according to claim 4, wherein a concave groove is formed in a circumferential surface of the disk-shaped rotating tool.   The method for manufacturing a heat transfer plate according to any one of claims 1 to 5, wherein a degreasing step of degreasing the base member and the lid plate is performed before the temporary joining step.   A plating step of providing a plating layer by plating with a metal having a melting point lower than that of the base member and the lid plate on either the side wall of the lid groove or the side surface of the lid plate before the temporary joining step. The manufacturing method of the heat exchanger plate as described in any one of Claims 1 thru | or 6 characterized by the above-mentioned.   8. The temporary joining step according to claim 1, wherein, in the temporary joining step, the pinless rotating tool or the disk-shaped rotating tool is intermittently pressed along the abutting portion to perform temporary joining by frictional heat. 9. The manufacturing method of the heat exchanger plate as described in any one of Claims.   The heat transfer plate according to any one of claims 1 to 8, wherein in the inflow stirring step, a tip of the inflow stirring rotary tool is inserted deeper than a bottom surface of the lid groove. Production method.   The heat transfer plate according to any one of claims 1 to 9, wherein, in the inflow stirring step, the plasticized region formed in the temporary joining step is stirred by the inflow stirring rotary tool. Manufacturing method.   After the inflow stirring step, an upper lid groove closing step of disposing an upper lid plate covering the lid plate on an upper lid groove formed wider than the lid groove on the surface side of the lid groove of the base member; Including a top lid joining step of performing frictional stirring between the base member and the top lid plate by relatively moving the rotary tool for joining along the abutting portion between the side wall of the top lid groove and the side surface of the top lid plate. The manufacturing method of the heat exchanger plate as described in any one of Claims 1 thru | or 10 characterized by the above-mentioned.

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